Switchable thermal energy recovery system

Abstract

This utility model relates to a switchable heat recovery system, comprising a primary flue gas cooler, a first valve group, a secondary flue gas cooler, a second valve group, and a heat pump. The primary flue gas cooler is connected to an external heating water supply pipeline; the first valve group is connected to the pipeline of the primary flue gas cooler; the secondary flue gas cooler is connected to the primary flue gas cooler; the second valve group is connected to the pipeline of the secondary flue gas cooler; and the heat pump is connected to the pipelines of both the first and second valve groups. Through the coordinated control of the first and second valve groups, the pipeline switching between the primary and secondary flue gas coolers can be achieved under different operating modes. The switchable heat recovery system according to this utility model embodiment can effectively adapt to conventional waste heat utilization modes, conventional and deep waste heat utilization coupled modes, and all deep waste heat utilization modes, flexibly adjusting the waste heat recovery method of flue gas, improving energy utilization efficiency and reducing the energy consumption of gas boilers while ensuring heating water supply.

Description

Technical Field

[0001] This utility model relates to the field of heat energy recovery technology, and in particular to a switchable heat energy recovery system. Background Technology

[0002] In the current field of heat recovery technology, traditional heating systems mostly use single heat source equipment, such as gas boilers, equipped with only simple waste heat recovery devices, often achieving only basic flue gas waste heat recovery. Existing systems operate in a single mode, lacking flexible heat distribution and control mechanisms. They cannot efficiently switch between different modes such as conventional heating, waste heat utilization, and advanced waste heat utilization based on actual heating demand and waste heat recovery status, resulting in low overall system energy efficiency. This severely restricts the further development of heat recovery systems in the field of energy conservation and emission reduction. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a switchable heat recovery system. By rationally connecting the first, second, third, and fourth pipelines and installing valve groups on the pipelines, flexible switching and precise control of different heat recovery paths can be achieved. This effectively solves the problems of low waste heat recovery efficiency, single operating mode, and inflexible heat distribution in traditional systems. The system can freely switch between modes such as conventional waste heat utilization, coupled waste heat utilization, and deep waste heat utilization according to actual needs, significantly improving heat recovery efficiency and overall system energy efficiency, and solving the problems mentioned in the background technology.

[0004] This utility model provides the following technical solution: a switchable heat recovery system, including a boiler primary flue gas cooler, a first valve group, a boiler secondary flue gas cooler, a second valve group, and a heat pump;

[0005] The boiler's primary flue gas cooler is connected to the external heating water supply pipeline;

[0006] The first valve group is connected to the pipeline of the boiler's primary flue gas cooler;

[0007] The boiler's secondary flue gas cooler is connected to the boiler's primary flue gas cooler;

[0008] The second valve group is connected to the boiler's secondary flue gas cooler piping;

[0009] The heat pump is connected to the piping of the first valve group and the second valve group respectively.

[0010] In one embodiment of the utility model, the first valve group includes a first valve and a second valve;

[0011] The first valve is connected to the outlet pipe of the boiler's primary flue gas cooler;

[0012] The second valve is connected to the inlet pipe of the boiler's primary flue gas cooler.

[0013] In one embodiment of the utility model, the second valve group includes a third valve and a fourth valve;

[0014] The third valve is connected to the outlet pipe of the boiler's secondary flue gas cooler;

[0015] The fourth valve is connected to the inlet pipe of the boiler's secondary flue gas cooler.

[0016] In one embodiment of the utility model, the outlet of the heat pump on the refrigeration cycle side is connected to the pipelines of the second valve and the fourth valve, respectively.

[0017] The water inlet on the cooling cycle side of the heat pump is connected to the pipelines of the first valve and the third valve, respectively.

[0018] In one embodiment of the utility model, a third valve group, a fourth valve group, and a fifth valve group are also included;

[0019] One end of the third valve group is connected to the boiler primary flue gas cooler pipeline, and the other end of the third valve group is connected to the external heating water supply pipeline.

[0020] The fourth valve group is connected to the heat pump pipeline, and the fifth valve group is connected to the external heating return water pipeline.

[0021] In one embodiment of the utility model, the third valve group includes a fifth valve, and the fourth valve group includes a sixth valve, a seventh valve, and an eighth valve;

[0022] One end of the fifth valve is connected to the boiler's primary flue gas cooler pipeline, and the other end of the fifth valve is connected to the external heating water supply pipeline.

[0023] The seventh valve is connected to the pipelines of the second and sixth valves respectively;

[0024] The eighth valve is connected to the pipelines of the fourth and seventh valves respectively;

[0025] The outlet of the heat pump on the refrigeration cycle side is connected to the eighth valve pipeline.

[0026] In one embodiment of the utility model, the fifth valve group includes a regulating valve disposed between the inlet pipe on the heat exchange side of the heat pump and the outlet pipe on the heat exchange side of the heat pump.

[0027] In one embodiment of the utility model, a gas-fired boiler is also included. The inlet of the gas-fired boiler is connected to the regulating valve and the outlet pipe on the heat exchange side of the heat pump, respectively. The outlet of the gas-fired boiler is connected to the external heating water supply pipe.

[0028] The primary flue gas cooler of the boiler is connected to the gas-fired boiler through the boiler chimney, and the secondary flue gas cooler of the boiler is connected to the primary flue gas cooler of the boiler through the boiler chimney.

[0029] In one embodiment of the utility model, a refrigerant water circulation pump is also included. The inlet of the refrigerant water circulation pump is connected to the pipelines of the first valve and the third valve, respectively, and the outlet of the refrigerant water circulation pump is connected to the inlet pipeline of the refrigeration circulation side of the heat pump.

[0030] In one embodiment of the utility model, it further includes a first calorimeter, a second calorimeter, a third calorimeter, and a fourth calorimeter;

[0031] The first calorimeter is used to measure the heat supply of the gas-fired boiler, the second calorimeter is used to measure the waste heat recovery of the boiler's primary flue gas cooler, the third calorimeter is used to measure the heat supply of the heat pump, and the fourth calorimeter is used to measure the deep waste heat extraction.

[0032] The beneficial effects of this utility model are:

[0033] This switchable heat recovery system connects the boiler's primary flue gas cooler to the external heating water supply pipeline. In conventional waste heat utilization mode, the extracted flue gas waste heat can be directly supplied to the external heating system, reducing dependence on the boiler heat source, lowering fuel consumption, preheating the heating return water, improving boiler heat exchange efficiency and lifespan, ensuring stable water supply temperature, and providing a basis for heat distribution in other operating modes, thus enhancing system operational flexibility. The first valve group, connected to the boiler's primary flue gas cooler pipeline, can precisely control the flow rate and direction of the medium in the primary flue gas cooler under different operating modes, ensuring it is always in optimal heat exchange condition and achieving stable and precise waste heat recovery. The boiler's secondary flue gas cooler is connected to the primary flue gas cooler, constructing a two-stage series waste heat extraction system, realizing tiered utilization of flue gas waste heat, improving overall recovery efficiency, reducing the load on a single flue gas cooler, and extending equipment lifespan. The second valve group, connected to the boiler's secondary flue gas cooler pipeline, ensures efficient operation of the secondary flue gas cooler under different modes, achieves reasonable distribution of chilled water flow, and has fault isolation capabilities, improving system operational reliability. The heat pump is connected to the first valve group and the second valve group respectively to form a closed-loop control system that first extracts waste heat and then improves quality. This system ensures that the heat pump obtains a stable heat source in different modes, improves operating efficiency, balances the flow of refrigerant water, and extends its service life.

[0034] Other features and aspects of the present invention will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0035] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of the present invention together with the specification and serve to explain the principles of the present invention.

[0036] Figure 1This diagram shows the main structure of the switchable heat recovery system according to an embodiment of the present invention. Detailed Implementation

[0037] Various exemplary embodiments, features, and aspects of the present invention will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0038] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0041] Furthermore, to better illustrate this utility model, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this utility model can be implemented even without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail, in order to highlight the main points of this utility model.

[0042] This utility model's switchable heat recovery system is a high-efficiency energy utilization device based on the cascade extraction of waste heat from flue gas in gas-fired boilers and flexible switching between multiple modes. In the field of heat recovery technology, it plays a role in deeply recovering waste heat from boiler flue gas, reducing gas consumption and carbon emissions, ensuring stable energy supply to the heating system, and improving overall energy utilization efficiency.

[0043] Specific references Figure 1As a specific embodiment of the switchable heat recovery system of this utility model, the switchable heat recovery system includes: a boiler primary flue gas cooler 110, a first valve group, a boiler secondary flue gas cooler 120, a second valve group, and a heat pump 230. This switchable heat recovery system is mainly composed of the boiler primary flue gas cooler 110, the first valve group, the boiler secondary flue gas cooler 120, the second valve group, and the heat pump 230. It realizes the cascade extraction and quality improvement of the waste heat of the flue gas of the gas boiler 220. By precisely controlling the flow direction and flow rate of the medium through the valve group, it can flexibly switch between three operating modes: conventional waste heat utilization, conventional and deep waste heat utilization coupling, and full deep waste heat utilization. It can directly recover the sensible heat of the flue gas to reduce the boiler heating load, and can also improve the quality of waste heat with the help of the heat pump 230 to achieve deep recovery, ultimately achieving the goals of energy saving, consumption reduction, stable heating, and improved comprehensive energy utilization efficiency.

[0044] The boiler primary flue gas cooler 110 is connected to the external heating water supply 250 pipeline, and the waste heat of the flue gas recovered by the boiler primary flue gas cooler 110 is directly transmitted to the external heating water supply 250 system to provide an additional heat source for heating.

[0045] The first valve group is connected to the pipeline of the boiler primary flue gas cooler 110. The first valve group controls the on / off state and flow rate of the medium flowing through the boiler primary flue gas cooler 110, adapting to different operating modes.

[0046] The boiler secondary flue gas cooler 120 is connected to the boiler primary flue gas cooler 110 to form a series structure, so that the flue gas cooled by the boiler primary flue gas cooler 110 can enter the boiler secondary flue gas cooler 120 to further extract waste heat and improve the overall recovery efficiency.

[0047] The second valve group is connected to the pipeline of the boiler secondary flue gas cooler 120, which regulates the refrigerant water flowing through the boiler secondary flue gas cooler 120 to ensure its stable flow in different modes. It can also cut off the passage in case of equipment failure to ensure system operation.

[0048] The heat pump 230 is connected to the pipelines of the first valve group and the second valve group respectively, and obtains chilled water heated by the flue gas cooler from the two valve groups to provide a stable heat source for the heat pump 230, while adapting to the waste heat utilization needs under different modes.

[0049] Furthermore, such as Figure 1As shown, the boiler primary flue gas cooler 110 is connected to the external heating water supply 250 pipeline for transporting and recovering waste heat. The first valve group is connected to the boiler primary flue gas cooler 110 pipeline to regulate the on / off and flow direction of the medium. The boiler secondary flue gas cooler 120 is connected to the boiler primary flue gas cooler 110 to further enhance waste heat extraction. The second valve group is connected to the boiler secondary flue gas cooler 120 pipeline to precisely control its medium circulation. The heat pump 230 is connected to the first valve group and the second valve group pipeline respectively. With the help of the medium adapted by the valve group, the waste heat quality is improved and the energy is used flexibly. All components are connected in this way to build a thermal energy utilization system for the cascade recovery of flue gas waste heat and multi-mode switching.

[0050] In this embodiment, the first valve group includes a first valve 130 and a second valve 140. The first valve 130 is connected to the outlet pipe of the primary flue gas cooler 110 of the boiler, and the second valve 140 is connected to the inlet pipe of the primary flue gas cooler 110 of the boiler. The first valve group consists of the first valve 130 and the second valve 140. The first valve 130 is installed on the outlet pipe of the primary flue gas cooler 110 of the boiler to control the flow of the medium at the outlet end of the primary flue gas cooler 110. The second valve 140 is installed on the inlet pipe of the primary flue gas cooler 110 of the boiler to realize the opening and closing and regulation of the medium at the inlet end of the primary flue gas cooler 110 of the boiler.

[0051] In this embodiment, the second valve group includes a third valve 150 and a fourth valve 160. The third valve 150 is connected to the outlet pipe of the secondary flue gas cooler 120 of the boiler, and the fourth valve 160 is connected to the inlet pipe of the secondary flue gas cooler 120 of the boiler. The second valve group includes the third valve 150 and the fourth valve 160. The third valve 150 is installed on the outlet pipe of the secondary flue gas cooler 120 of the boiler to control the flow of the medium at the outlet of the secondary flue gas cooler 120. The fourth valve 160 is installed on the inlet pipe of the secondary flue gas cooler 120 of the boiler to realize the on / off control and regulation of the inlet medium of the secondary flue gas cooler 120 of the boiler.

[0052] In this embodiment, the outlet of the cooling cycle side 231 of the heat pump 230 is connected to the second valve 140 and the fourth valve 160 via pipelines, and the inlet of the cooling cycle side 231 of the heat pump 230 is connected to the first valve 130 and the third valve 150 via pipelines. The outlet of the cooling cycle side 231 of the heat pump 230 is connected to the second valve 140 and the fourth valve 160 via pipelines, allowing the refrigerant water output by the heat pump 230 to be delivered to the inlet of the boiler's primary flue gas cooler 110 and the boiler's secondary flue gas cooler 120. Simultaneously, the inlet of the cooling cycle side 231 of the heat pump 230 is connected to the first valve 130 and the third valve 150 via pipelines to receive refrigerant water from the outlet of the boiler's primary flue gas cooler 110 and the boiler's secondary flue gas cooler 120.

[0053] In this embodiment, a third valve group, a fourth valve group, and a fifth valve group are also included. One end of the third valve group is connected to the boiler's primary flue gas cooler 110 pipeline, and the other end is connected to the external heating water supply 250 pipeline. The fourth valve group is connected to the heat pump 230 pipeline, and the fifth valve group is connected to the external heating return water 260 pipeline. The third valve group is additionally provided with one end connected to the boiler's primary flue gas cooler 110 via a pipeline, and the other end connected to the external heating water supply 250 pipeline. The fourth valve group is entirely connected to the heat pump 230 pipeline. The fifth valve group is connected to the external heating return water 260 pipeline, forming a multi-path control structure.

[0054] In this embodiment, the third valve group includes a fifth valve 170, and the fourth valve group includes a sixth valve 180, a seventh valve 190, and an eighth valve 200. One end of the fifth valve 170 is connected to the pipeline of the boiler's first-stage flue gas cooler 110, and the other end of the fifth valve 170 is connected to the pipeline of the external heating water supply 250. The seventh valve 190 is connected to the pipelines of the second valve 140 and the sixth valve 180, respectively. The eighth valve 200 is connected to the pipelines of the fourth valve 160 and the seventh valve 190, respectively. The outlet of the cooling cycle side 231 of the heat pump 230 is connected to the eighth valve. The valve group 200 is connected to the pipeline. The third valve group only contains the fifth valve 170. One end of the fifth valve 170 is connected to the boiler primary flue gas cooler 110 pipeline, and the other end is connected to the external heating water supply 250 pipeline. The fourth valve group consists of the sixth valve 180, the seventh valve 190, and the eighth valve 200. The seventh valve 190 is connected to the second valve 140 and the sixth valve 180 through pipelines. The eighth valve 200 is connected to the fourth valve 160 and the seventh valve 190 through pipelines. The outlet of the refrigeration cycle side 231 of the heat pump 230 is connected to the eighth valve 200 through a pipeline.

[0055] In this embodiment, the fifth valve group includes a regulating valve 210, which is disposed between the inlet pipe and the outlet pipe of the heat exchange side 232 of the heat pump 230. The fifth valve group contains only the regulating valve 210, which is installed between the inlet pipe and the outlet pipe of the heat exchange side 232 of the heat pump 230 to regulate the medium flow rate and reflux of the heat exchange side 232 of the heat pump 230.

[0056] In this embodiment, a gas-fired boiler 220 is also included. The inlet of the gas-fired boiler 220 is connected to the regulating valve 210 and the outlet pipe of the heat exchange side 232 of the heat pump 230, respectively. The outlet of the gas-fired boiler 220 is connected to the external heating water supply 250 pipe. The primary flue gas cooler 110 of the boiler is connected to the gas-fired boiler 220 through the boiler chimney. The secondary flue gas cooler 120 of the boiler is connected to the primary flue gas cooler 110 of the boiler through the boiler chimney. The gas-fired boiler 220 is added, and its inlet is connected to the regulating valve 210 and the outlet of the heat exchange side 232 of the heat pump 230 through pipes to receive the heating return water and the water heated by the heat pump 230. The outlet is connected to the external heating water supply 250 pipe to output hot water. The primary flue gas cooler 110 of the boiler is connected to the gas-fired boiler 220 through the boiler chimney to receive the flue gas discharged from the boiler. The secondary flue gas cooler 120 of the boiler is connected to the primary flue gas cooler 110 through the boiler chimney to receive the cooled flue gas.

[0057] In this embodiment, a refrigerant water circulation pump 240 is also included. The inlet of the refrigerant water circulation pump 240 is connected to the pipelines of the first valve 130 and the third valve 150, respectively. The outlet of the refrigerant water circulation pump 240 is connected to the inlet pipeline of the cooling circulation side 231 of the heat pump 230. The addition of the refrigerant water circulation pump 240, whose inlet is connected to the first valve 130 and the third valve 150 through pipelines, receives refrigerant water from the boiler primary flue gas cooler 110 and the boiler secondary flue gas cooler 120. The outlet is connected to the inlet of the cooling circulation side 231 of the heat pump 230 through pipelines, providing power for the refrigerant water circulation.

[0058] In this embodiment, a first calorimeter 270, a second calorimeter 280, a third calorimeter 290, and a fourth calorimeter 300 are also included. The first calorimeter 270 is used to measure the heat supply of the gas boiler 220, the second calorimeter 280 is used to measure the waste heat recovery of the boiler's primary flue gas cooler 110, the third calorimeter 290 is used to measure the heat supply of the heat pump 230, and the fourth calorimeter 300 is used to measure the deep waste heat extraction.

[0059] Further, in the conventional waste heat utilization mode: gas boiler 220 is running, heat pump 230 is shut down, and refrigerant water circulation pump 240 is shut down. Seventh valve 190 and first valve 130 are closed, while the others are open. Part of the heating return water enters the boiler for heating, and part passes through sixth valve 180 and second valve 140, then through the boiler's primary flue gas cooler 110 for heating, and finally through fifth valve 170, merges with the outlet water from gas boiler 220 to provide heating water to the outside. At this time, the primary flue gas cooler 110 and gas boiler 220 operate in parallel for heating. First calorimeter 270 measures the heat supplied by gas boiler 220, and second calorimeter 280 measures the amount of waste heat recovered.

[0060] Furthermore, the conventional waste heat utilization and advanced waste heat utilization coupling mode is as follows: the gas boiler 220 operates, the heat pump 230 operates, and the chilled water circulation pump 240 operates. The seventh valve 190 and the first valve 130 are closed, while the others are open. The external heating return water 260 is regulated by the regulating valve 210; a portion flows through the heat pump 230 for heating and then mixes with the water flowing through the regulating valve 210. The mixed external heating return water 260 is partially heated by the gas boiler 220, and partially heated by the boiler's primary flue gas cooler 110 via the sixth valve 180 and the second valve 140. After passing through the fifth valve 170, it merges with the water output from the gas boiler 220 to provide heating water to the outside. The chilled water from the heat pump 230, after exiting the heat pump 230, passes through the eighth valve 200 and the fourth valve 160 to enter the boiler's secondary flue gas cooler 120 for heating. It then flows through the third valve 150, is pressurized by the chilled water circulation pump 240, and flows back to the heat pump 230 for cooling. The first calorimeter measures 270 units of heat supplied by the gas-fired boiler (220 units), the second calorimeter measures 280 units of waste heat recovered by the boiler's primary flue gas cooler (110 units), the fourth calorimeter measures 300 units of deep waste heat extraction, and the third calorimeter measures 290 units of heat supplied by the heat pump (230 units).

[0061] Furthermore, the entire deep waste heat utilization mode is as follows: gas boiler 220 operates, heat pump 230 operates, and refrigerant water circulation pump 240 operates. Fifth valve 170 and sixth valve 180 are closed, while the others are open. External heating return water 260 is regulated by regulating valve 210. A portion flows through heat pump 230 for heating and mixes with the water flowing through regulating valve 210. The mixed water then enters gas boiler 220 for heating and provides heating / hot water to the outside. Refrigerant water from heat pump 230, after exiting heat pump 230, passes through eighth valve 200. A portion flows through fourth valve 160, is heated by boiler secondary flue gas cooler 120, and then passes through third valve 150. Another portion flows through seventh valve 190 and second valve 140, is heated by boiler primary flue gas cooler 110, and then passes through first valve 130. Both portions of refrigerant water are pressurized by refrigerant water circulation pump 240 and flow back to heat pump 230 for cooling. The first calorimeter measures 270 units of heat supplied by the gas boiler, 220 units of heat supplied by the gas boiler; the fourth calorimeter measures 300 units of heat extracted from deep waste heat; and the third calorimeter measures 290 units of heat supplied by the heat pump, 230 units of heat supplied by the heat pump.

[0062] This utility model's switchable heat recovery system can extract waste heat from flue gas through a relay of primary and secondary flue gas coolers in the boiler. Multiple sets of valves precisely control the direction and flow of the medium, a heat pump improves the quality of waste heat, a chilled water circulation pump ensures circulation, a calorimeter provides accurate measurement, and it works in conjunction with a gas boiler and external heating pipelines to achieve tiered and deep recovery of waste heat from flue gas. It can flexibly switch operating modes, reduce gas consumption, stably guarantee heating energy supply, and significantly improve the overall efficiency of energy utilization.

[0063] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A switchable heat recovery system, characterized in that, It includes the boiler primary flue gas cooler, the first valve group, the boiler secondary flue gas cooler, the second valve group, and the heat pump; The boiler's primary flue gas cooler is connected to the external heating water supply pipeline; The first valve group is connected to the pipeline of the boiler primary flue gas cooler; The boiler secondary flue gas cooler is connected to the boiler primary flue gas cooler; The second valve group is connected to the pipeline of the boiler's secondary flue gas cooler; The heat pump is connected to the pipelines of the first valve group and the second valve group respectively.

2. The switchable heat recovery system according to claim 1, characterized in that, The first valve group includes a first valve and a second valve; The first valve is connected to the outlet pipe of the primary flue gas cooler of the boiler; The second valve is connected to the inlet pipe of the primary flue gas cooler of the boiler.

3. The switchable heat recovery system according to claim 2, characterized in that, The second valve group includes a third valve and a fourth valve; The third valve is connected to the outlet pipe of the boiler's secondary flue gas cooler; The fourth valve is connected to the inlet pipe of the boiler's secondary flue gas cooler.

4. The switchable heat recovery system according to claim 3, characterized in that, The outlet of the heat pump on the refrigeration cycle side is connected to the pipelines of the second valve and the fourth valve, respectively. The inlet of the heat pump on the refrigeration cycle side is connected to the pipelines of the first valve and the third valve, respectively.

5. The switchable heat recovery system according to claim 4, characterized in that, It also includes the third valve group, the fourth valve group, and the fifth valve group; One end of the third valve group is connected to the boiler primary flue gas cooler pipeline, and the other end of the third valve group is connected to the external heating water supply pipeline. The fourth valve group is connected to the heat pump pipeline, and the fifth valve group is connected to the external heating return water pipeline.

6. The switchable heat recovery system according to claim 5, characterized in that, The third valve group includes a fifth valve, and the fourth valve group includes a sixth valve, a seventh valve, and an eighth valve; One end of the fifth valve is connected to the boiler primary flue gas cooler pipeline, and the other end of the fifth valve is connected to the external heating water supply pipeline. The seventh valve is connected to the pipelines of the second valve and the sixth valve, respectively. The eighth valve is connected to the pipelines of the fourth valve and the seventh valve respectively; The outlet of the heat pump on the refrigeration cycle side is connected to the eighth valve pipeline.

7. The switchable heat recovery system according to claim 5, characterized in that, The fifth valve group includes a regulating valve, which is disposed between the inlet pipe on the heat exchange side of the heat pump and the outlet pipe on the heat exchange side of the heat pump.

8. The switchable heat recovery system according to claim 7, characterized in that, It also includes a gas-fired boiler, the inlet of which is connected to the regulating valve and the outlet pipe of the heat exchange side of the heat pump, and the outlet of which is connected to the external heating water supply pipe. The primary flue gas cooler of the boiler is connected to the gas-fired boiler via the boiler chimney, and the secondary flue gas cooler of the boiler is connected to the primary flue gas cooler of the boiler via the boiler chimney.

9. The switchable heat recovery system according to claim 8, characterized in that, It also includes a refrigerant water circulation pump, the inlet of which is connected to the pipelines of the first valve and the third valve respectively, and the outlet of which is connected to the inlet pipeline of the refrigeration circulation side of the heat pump.

10. The switchable heat recovery system according to claim 9, characterized in that, It also includes a first calorimeter, a second calorimeter, a third calorimeter, and a fourth calorimeter; The first calorimeter is used to measure the heat supply of the gas-fired boiler, the second calorimeter is used to measure the waste heat recovery of the boiler's primary flue gas cooler, the third calorimeter is used to measure the heat supply of the heat pump, and the fourth calorimeter is used to measure the deep waste heat extraction.

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